Portable electrical drilling-machine.



No. 634,!65. Patented Oct. 3, I899.

A. L. CRONEAU PORTABLE ELECTRICAL DRILLING MACHINE.

(Application filed June 23, 1899.| (No Model.)

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ATTORNEYS Patented Oct. 3, 1399. A. L. CBONEAU. PORTABLE ELECTRICAL DRILLING MACHINE.

' (Application filed June 23, 1899.)

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(No Model.)

UNITED STATES ALrnoN'sn LOUIS GRONEAU, or PARIS, FRANCE.

P ORTABLE ELECTRICAL DRILLING-MACHINE.

SPECIFICATION forming part of Letters Patent No. 634,165, dated October 3, 1899.

Application filed June 23, 1899. Serial No. 721,674. (No model.)

To all whom it may concern:

Be it known that I, ALPHONSE LOUIS CR0- NEAU, a citizen of the French Republic, residing at Paris, Department of the Seine, France, have invented certain new and useful Improvements in Portable Electrical Drilling- Machines, of which the following is a specification.

My invention relates to a portable electrical drilling-machine for readily drilling flat metal sheets or plates.

The machine is intended to perform drilling operations similar to those of drillingmachines of present construction that operate with magnetic adhesion to the plate to be drilled; but my improved machine has the advantage over these of great lightness, cheapness, and portability, and is especially adapted for a class of work for which the said machines are not well adapted. The said machines of present construction are heavy and require several men to Work them, whereas my improved machine has the whole of its working parts combined in a compact manner, so that it can be readily moved about and worked by a single operator, being specially applicable for drilling flat metal surfaces, such as the iron decks of ships or floorplates of bridges and the like.

I will describe the construction of the improved machine with reference to the accompanying drawings, in which Figure 1 shows a side elevation of the machine; Fig. 2, a plan; and Fig. 3, a cross-section on line A B, Fig. 1.

The same numerals of reference represent the same parts in each of the figures.

The machine consists of a metal plate 1, which carries the whole of the parts constituting the drilling-machine. To the under side of this plate in the same vertical plane as the drilling-tool are fixed two electromagnets 8, capable of producing on a plate of about ten millimeters an adhesion of from five hundred to six hundred kilos, suflicient for drilling holes of thirty to forty millimeters. The drill-carrier 2 is directly actuated by the electromotor through an elastic coupling 5 without the intermediary of a flexible member and in using the ordinary means of mechanical connection.

The resistances and the starting and controlling commutator 6 for the motor 4 are fixed in front in convenient position for the operator. The current required for the adhesion electromagnets is supplied through the same commutator, the wires being connected to the first contact after that for stopplug.

The drilling-tool 10 is carried in the usual manner by the tool-carrier 2, and its downward motion is regulated in the usual manner by a screw-spindle with hand-wheel 11.

The combined apparatus is supported on the one hand by the electromagnets 3 and on the other hand by a wheel 9 of the same height as the electromagnets, so that the drilling-tool is always perpendicular to the plane passing through the bases of the two electromagnets and the under side of the wheel.

The machine is moved by means of the han dles 7, which support a wooden plate 8, which constitutes a seat for the operator, who thus has the drill and the controlling-commutator conveniently before him. The weight of the operator balances that of the motor 4 relatively to the fulcrum formed by the electromagnets, and their weight consequently assists themagnetic adhesion.

The above-described machine is particularly useful for drilling fiat sheets or plates for metal floors and decks of ships. As before stated, a single workman can move and operate the machine, while all other similar machines require at least two men. It does away with the flexible connection which is necessary with the ordinary drilling-machines with magnetic adhesion.

Having thus described this invention and the best means I know of carrying the same into practical effect, I claim- Apparatus for drilling metal sheets or plates, in particular flat metal sheets, with magnetic adhesion device for keeping the surface to be drilled against the drilling-tool, consisting of the combination with a metal platform suitably supported by a single wheel and two electromagnets constituting the feet of'the machine, and serving to produce the requisite adhesion of the machine to the surface, to be drilled, a bracket carrying the drilling-tool fixed on the platform immediately over the electromagnets so that the drill he faces the machine in a convenient position 1 o operates between these, an electromotorfixed for controlling its action, substantially as on the rear part of the platform connected herein described. to the driving-shaft of the drilling-tool by an In Witness whereof I have hereunto set my 5 elastic coupling resistance and a commutahand in presence of two witnesses.

tor included in the supply-circuit of the mo- ALPHONSE LOUIS, CRONEAU. tor and electromagnets, carried on the front \Vitnesses: part of the platform and handles on the plat- EDWARD P. MACLEAN form carrying a seat for the operator so that J ULEs FAY'OLLET. 

